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314m Ea -5 (No Model. 3S11eets-Sheet 1.

A. K. DEVENPORT. SANDPAPERING MACHINE.

No. 445,749. I Patented Feb. 3, 1891.

fillllllllll mineases (No Model.) 2 Sheets-Sheet 2. A.K.DEVENPORT.SANDPAPERING MAUHINE. V Patented Feb. 3

STATES "TENT.

thr ce.

ARTHUR K. DEVENPORT, or JAoKson, MICHIGAN, ASSIGNOR or ONE-HALF TO s.HEYSER & sons, or SAME PnAoE.

SANDPAPEiNG-MAGHlNE.

SPECIFICATION forming part Of Letters 2atent No. 445,749, dated February3, 1891.

Application filed September 26, 1888. Serial No. 325,122- (No model.)

To all whom itmay oonccrm Beit known that i, ARTHUR K. DEiIENPoR'r,

a citizen. of the United States, residing at arbor and arranged to berotated at high speed, thc disksbeing free at their outer edges.

In the drawings, Figure 1 is a perspective view of a machine designed tocarry out my improvements, one of the disks being shown in position uponand the other removed from the arbor; Fig. 2, a sectional viewof theparts in position; Figs. 3 aud t, similar views showing modifications;Figs. 5 .and -6, enlarged Views designed to illustratethe action of themachine; Figure 7, a viewillustrating means for'adjusting the bridge orwork-support independently of the table.

Prior to my invention machines for sand-papering panels and otherwood-work have been constructed with two disks or'rotary heads,

each faced with sand-paper or other abrading material, which materialhas, however, been tightly drawn or stretched over the face of the diskor head and clamped or bound at the edges. To prevent the outer edges ofthe disks or heads thus covered from mar-ring the work, it has beencustomary to round off or bevel them; but as a result of suchconstruction it has beenimpracticable to work close up to the edges orboundaries of the raised portion of the panel, ,and in attempting to doso the edges have unavoidably been cut away. In other words, one of twodifliculties has inevitably resulted from the use of abradingdislrshaving fixed edges-failur'e to dress the entire face of the sunkenportion or cutting away the edges of the raised portion. I avoid thesedifiiculties and attain most satisfactory results by the employment ofthe free-edged itbrading-disks in the manner explained beow. i r

A indicatesastout frame, which may be of wood or metal; B, an arborprovided with a band-pulley G and mounted in boxes or.bear-,

ings D upon the frame A, and E E two disks of sand-paper orothersuitable material, as

emery-paper or cloth, applied to said arbor and arranged to rotatetherewith, the disks being clamped in any suitable manner at theircentral portions, but free at their outer edges.

These parts are all that are essential to the carrying out of myinvention; but better results may be secured by the adoption of thefurther parts and features indicated in the drawings. Thus in practice Ifind it advantageous to employ two disks F F, one back or outside ofeach of the abrading-disks E E, to

prevent the latter from falling over, buckling, or otherwise getting,out of shape, and a spacing collar or disk G between the abradiug-disks,to serve the double purpose of determining their distance apart and ofaiding in clamping. them.

The outside or supporting disks are preferably made of metal and quitethin, theirinner or opposing faces being slightly beveled or curvedoutward toward their peripheries, as best shown in Figs. 5 and 6. isformed with a reduced end portion, as shown in Figs. 1 and 2, and with afixed collar or shoulder a, against which one of the supporting-disksrests, and abrading-dlisk E coming next, then the spacing-collar G, thenthe outer abrading-disk, followed by the sec= ond'supporting-disk h, andlastly by a nut H, which screws upon the threaded end of the arbor andbinds the several disks together and secures them so firmly to the arborthat they rotate therewith. A feather or spline The arbor B may beprovided to prevent the several disks from turning upon or independentlyof the arbor; but this is not important and is not ordinarily used. Byvarying the thickness of the spacing disk or collar G the distancebetween the abradingdisks may be varied and determined asrequired. Alike'result may also be attained by either of the modificationsillustrated in Figs. 3 and 4.

In Fig. 3 I have shown a separate arbor B for each of the abrading-diskswith its backing or supporting disk, one of the arbors beinglongitudinally adjustable in its bearings IOO LII to permit variation ofthe distance between the disks. fork seated in a circumferential groovein the arbor B','has swiveled in it an adjusting-n screw J, the stem ofwhich screws into asuitably-threaded socket in-*one of the bearingsrepresented as passing centrally or axially through a tubular arbor B",the tubular arbor being formed with a longitudinal slot 1) to receive ascrew 0, which serves to clamp the 1 central arbor and hold it firmlyin'any desired relation to the fixed arbor. The term fixed as-abveemployed has referenceonly to longltudinal'movement, it beingunderstood, of course, that both arbors rotate.

I. It is not essential that more than one abradin'g-disk be used, thoughit' is generally de-v sirable to dress or smooth, both faces of thework, and 'will therefore be desirable "ordinarlly to employ the two. Ifbut one be'uscd, any form of support, either the supportingd1sk F orafixed support, may be used to keep the work in position while beingacted upon by the abrading-disk.

K indicates a bridge-piece extending-between the disks from one end ofthe slot (1' of the work-tableL to the other end threofiits purposebeingto sustain the work while passing between the disks and to limitits'desce'utv between them. The work table is hinged or 7 otherwise madeadjustable as to height, and

by raising or lowering it the depth to which the work may enter may beregulated and 'variedat will.

Referring now to Figs.- 5'and 6,-the principle of operation will be morefully'explamed. Fig. '5 represents the ab'r'adingdISkS as they appearwhen at rest, their flexibility permitting them to fall back against thesupporting-disks or away from them, as may be. Fig. 6 represents theposition which the'fiexible disks will assume if. the outsidesupportingdisks be omitted or if they be conslderably beveled; so asto-"lea've acornparatlvely wide space between -the'plane of theabrading-disks a'ndthe inner faces of the supportingdisks. Under suchconditions the centrifugal force due to the high speed of rotation willcause the abrading-di'sks to straighten out in planes perpendicular tothe axis of the arbor,-as indicated; butif the'outside or supportingdisksbe not considerably beveled the abrading-disks will hugclosely tothem by reason of the expulsionof air'from between the abrading' and thesupporting disks and the pressure .of the'air'upon-th'e abrad1ng-faces-afact developcdlin practical use of the machine, Theb'ridge K may be adusted by means of set-screws, as indicated In Fig. 7, without alteringthe elevation of the table- The elevation of the work-table or itsA-yoke I, having the arms. of itsbridge being properly regulated, thefree edges of the abrading-disks will work up to but never beyond therequired point, and as a consequence the sunken, reduced, or beveledouter portions of .a panel orlike piece of work may-be perfectly-dressedevenup to and in the angle form d b the meeting ,i

-chineis referred to under the general and common name ofsandpapering-machine, it is not my intention to convey the idea that theinvention is restricted to the use of sandpaper disks. v

It has been proposed hitherto to make abrading and polishing disks fordental work and for cleaning or dressing shoe-soles" by gluing orcementing two disks of sand-paper or like abrading material to anintermediate disk or body of cloth or other material'whlch' will remain,pliable during the process of manufacture. It is manifest, however, thatan abrading-disk comprising two layers of abrading material, such assand-paper, emerypaper, or the like, an-tntermediate body, and twolayers of glue or ement will not possess great or even considerableflexibility. In one instance it has been proposed to perlmtjthe edges ofthe abrading-disks to project slightly beyond the intervening disk orbody, so as to bend over and cover the edge thereof, such constructionnecessarily involving the use of an intermediate body of considerablethickncss. Such disks are unsuited to the'work for which my machine isdesigned and cannot be successfully or advantageously'used therein,because the thickness and comparative stiffness of the composite diskspreclude the perfect freedom of movement and the ready and certainadaptation and adjustment of 'the' disks to the surfaces to be operatedupon, and for the further reason that it is only after continued use andwear that such "composite disks possess even the 'compara.

tively slight degree of flexibility claimed for them if they everpossess it,

To be effective for the purposes of my 1n- -vention the disks must be sothin and light and must possess such-degree of flexibility that thepartial vacuum produced by the ex- 'pulsion of air from between theabradingdisks 01 supports shall cause the'abradingdisks to'hug'n'ormallyto such backing or supporting disks and to lie flat and smooth thereon,while leaving their outer edges free from folds or'bends and.consequently in the other.

shape best adapted to permitthem to work closely into the angle wherethe raised portion and the reduced portion of the panel meet. Suchaction and result are unattainable with composite disks such asheretofore proposed.

Moreover, so far asI am aware,such composite disks have never beencombined with an independent backing or support; nor has any one beforeproposed to employ a; thin flexible disk with a backing or supportwithout securing the one firmly and fixedly to the This combinationenables me toattain results never before reached by any macline of thischaracter, so far as I have knowle ge.

Having thus described my invention, what Iclaimis- 1. In a machine forsmoothing wood or the like, the combination of a frame, awork-support, arotatable arbor, and a flexible smooth- 'ing-disk carried by said arborand free from its outer edge to the centralclamp, by which it is madefast to the arbor.

2. In asand papering-machine, the combination of a suitable frame, anarbor journaled therein and provided with a wheel through whichtoreceive motion from a suitable source, a flexible abrading-disk madefast at its center to the arbor, but free at its outer edge and arrangedto rotate with the arbor,

and a guide opposite the working face of the (1181; to guide the work inpassing the .same. 3. In a sand papering-machine, the combination of twoflexible abrading-disks, means for rotating said disks, and an,intermediate work-support, each disk being centrally supported, but freeat its periphery. 4. In combination with a suitable frame, awork-support mounted thereon and adjust- 40 ablerelatively thereto,anarbor mounted in WWW said frame, and a flexible abrading or smooth-- 6.The herein-described machine for dressing wood-work and the like,consisting pr a frame, an arbor mounted and rotatable therein, twoflexible abrading-disks concentrically secured upon said-arbor, butotherwise free, and two supporting-disks also carried by said arbor, onebehind each of the abradlngdisks.

7 The combination, with frame A and arborB, of disks E E,supporting-disks F F,

and an intermediate supportingsbridge.

8. In combination with frame A, arbor B, free flexible disks E E, andsupporting-disks FF, carried by said arbor, spacing-collar G,'interposed between the disks E E, substan tially as and for the purposeset forth.

9. In combination with frame'A and table L, having slot D, and awork-support or bridgearbor B and disks E E, carried by the arbor andextending through the sloton opposite sides of the bridge.

' In witness whereof I hereunto set my in the presence of two witnesses.

ARTHUR. K. DEVE'NPORT.

Witnesses:

Gno. N. WHITNEY, HENRY E. EDWARDS.

has 4 Corrections in Letters Patent No. 445,749.

Countersigned:

- It is hereby certified that in Letters Patent No. 445,749, gfantedFebmaty- 3, 1891,

upon the applieationtof Arthur K, Devenport, of J aoksen, Michigan, foran improve-* ment in fSandpapering-Maohines, errors appear i n theprinted specification requiring' correction, as follows: 113 line80,,page'l, the word and should read an; in lines 24 and 33, page3,'to.e words band papering-maehine should read sandpaper'ingmqoltinqandin line 71, same page, a, comma should be substituted for the'hyphenbe'atweexi the words bridge and ether; and the said Letters Patentshould iioe read with these corrections therein that the same mayconform to the record of the case in the fatent Office.

Signed, eountetsigned, and sealed this 10th dty of Febmary. A. D. 1891.

' smm OYRUS BUSSEY,

' 0. E. MITCHELL, v

Uommtmene r of Patsnta.

Assistant Secretary of the Ia tteripr.

